The frequency order for \(\gamma\text-\)rays (\(b\)), \(X\text-\)rays (\(a\)), and \(UV\text-\)rays (\(c\)) is:
1. \( b>a>c \) 2. \( a>b>c \)
3. \( c>b>a \) 4. \( a>c>b\)
Subtopic:  Electromagnetic Spectrum |
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The EM wave with the shortest wavelength among the following is:
1. Ultraviolet rays  2. \(X\)-rays
3. Gamma-rays  4. Microwaves  
Subtopic:  Electromagnetic Spectrum |
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Which colour of the light has the longest wavelength?

1. violet 2. red
3. blue 4. green
Subtopic:  Electromagnetic Spectrum |
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The decreasing order of wavelength of infrared, microwave, ultraviolet and gamma rays is:
1. gamma rays, ultraviolet, infrared, microwaves.
2. microwaves, gamma rays, infrared, ultraviolet.
3. infrared, microwave, ultraviolet, gamma rays.
4. microwave, infrared, ultraviolet, gamma rays.
Subtopic:  Electromagnetic Spectrum |
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The energy of the EM waves is of the order of \(15~\mathrm{keV}\). To which part of the spectrum does it belong?
1. X-rays
2. Infrared rays
3. Ultraviolet rays
4. \(\gamma\)-rays

Subtopic:  Electromagnetic Spectrum |
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Match List - I with List - II.
List -I (Electromagnetic waves) List - II (Wavelength)
(a) AM radio waves (i) \(10^{-10}~\text{m}\)
(b) Microwaves (ii) \(10^{2} ~\text{m}\)
(c) Infrared radiation (iii) \(10^{-2} ~\text{m}\)
(d) \(X\)-rays (iv) \(10^{-4} ~\text{m}\)

Choose the correct answer from the options given below:
(a) (b) (c) (d)
1. (ii) (iii) (iv) (i)
2. (iv) (iii) (ii) (i)
3. (iii) (ii) (i) (iv)
4. (iii) (iv) (ii) (i)
Subtopic:  Electromagnetic Spectrum |
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The biological importance of the ozone layer is:

1. it stops ultraviolet rays.
2. ozone layer reduces the greenhouse effect.
3. ozone layer reflects radio waves.
4. ozone layer controls \(\mathrm{O}_2 / \mathrm{H}_2\) ratio in the atmosphere.


 

Subtopic:  Electromagnetic Spectrum |
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